Auxiliary air controller for internal combustion engines



Sept. 5, 1939. A. H. WEIERTZ ET AL 2,171,735

AUXILIARY AIR CONTROLLER FOR INTERNAL COMBUSTION ENGINES Filed Sept. 19, 1958 Patented Sept. 5, 1939 PATENT OFFICE AUXILIARY AIR CONTROLLER FOR INTER- NAL COMBUSTION ENGINES Axel Hugo Weiertz and Per Axel Reinar Weiertz, Svedala, Sweden Application September 19, 1938, Serial No. 230,526- In Sweden September 20, 1937 4 Claims.

Our present invention relates to auxiliary air controllers for internal combustion engines and more particularly to such auxiliary air controllers for which we have obtained United States 5 Letters Patent No. 2,126,071 of August 9, 1938,

the object of our present invention being to provide an improved auxiliary air controller of the general character illustrated, described and. claimed in our said United States Patent No. 2,126,071.

One special object of our present invention is to facilitate and simplify the proper adjustment of the auxiliary air controller according to the different conditions prevailing at different engines on which the auxiliary air controller may be used. Another special object of the invention is to reduce the dimensions and the costs of manufacture of the auxiliary air controller.

With this and other objects in view, which will 20 appear as the description of the invention proceeds, the invention consists in the construction,

combination and arrangement of parts illustrated by way of example on the accompanying drawing and to be described hereinbelow, and finally 25 pointed out in the appended claims.

A preferred embodiment of the auxiliary air controller according to the invention is shown on the drawing in which Figs. 1 and 2 are two sections at right angles to each other through the auxiliary air controller proper, the means for operatively connecting the auxiliary air controller to the main air inlet valve or gas throttle, or to the controlling means therefor, being not shown since said connecting means may be of the 35 same kind as illustrated and described in our aforesaid United States Patent No. 2,126,071.

The same as in the aforesaid United States Patent No. 2,126,071 the auxiliary air controller proper comprises a casing I having a pin 3 jour- 40 naled therein, which carries an arm 5 provided with a roller 6 forming a movable support for a leaf spring 1. To the free end of the leaf spring I there is adjustably connected the end of the stem l3 of the auxiliary air supply valve [4.

g 45 The screw threaded end of the stem 13 passes through a hole in the leaf spring I and is provided with an adjustable nut 40. The other end of the leaf spring I is riveted to an arm 4| on an adjustable holder 42. In addition to the arm 4| 50 this holder comprises a further arm 43 and an ear 44 through which the holder is carried on a bolt 45 positioned in an inclination of about 45 to the vertical and having its lower end screwed into a threaded hole in the casing l as clearly shown 55 in Fig. 1. By means of anut 46, which is screwed on to the screw-threaded upper end of the bolt 45, and a leaf spring 41, which is secured against the casing I through the bolt 45 and with its bent free end rests against the arm 43, the ear 4 can be displaced up and down on the bolt 45. 5' When the nut 46 is screwed down on the bolt 45 the ear 44 is also displaced downwards against the action of the spring 41 which, due to the ear 44 having a loose fit on the bolt 45, always presses the arm 43 against a fixed pin 48 or the like in the casing I. If the nut 46 is screwed the other way the ear 44 is displaced upwards on the bolt'45 by the action of the spring 41.

The auxiliary air controller is provided with an air cleaner 30, and on the projecting end 15 of the pin 3 there is secured an arm 23 which is to be operatively connected to the means for adjusting (changing) the position of the main air supply valve or carburettor throttle of the engine on which the auxiliary air controller is mounted for use, in the manner illustrated and described in our United States Patent No. 2,126,071, to which reference is hereby made as regards the general arrangement and operation of the auxiliary air controller. 25

It is important that the biasing spring I for the auxiliary air supply valve M can be properly adjusted according to the conditions prevailing at the engine with which the auxiliary air controller is used. In the construction hereinbefore described adjustment for such purposes is performed in the following way. When the engine is idling the nut is screwed up or down until the position is found in which the engine runs most satisfactorily when unloaded and with the 3 carburettor throttle in normal position. When the engine is running under load with the carburettor throttle in fully or near fully open position the nut 46 is screwed up or down until the position is found in which the engine attains the 40 highest speed without change of the load or the position of the carburettor throttle. These two adjustments usually suffice for conditioning the auxiliary air controller according to the engine on which it is used, and both these adjustments are easy to perform. We wish it to be understood, however, that we have found it to be necessary, for making it possible to obtain good results with these two simple adjustments, that the leaf spring 1 must not rest against a ridge or the like on the 50 inside of the casing l as shown in our United States Patent No. 2,126,071, but must be unrestrained between its ends but for the support through the roller 6 or the like which is movable along the spring for changing the resiliency thereof according to the position of the carburettor throttle. One essential feature of our present invention, therefore, is to be seen therein that the spring I is free to bend according to its nature when supported in any intermediate point by the movable support 6 and actuated at its free end by the force acting on the auxiliary air supply valve M in the opening direction. A special advantage resides therein that the adjustment that is performed by screwing the nut has no noteworthy influence on the adjustment obtained by screwing the nut 46, and vice versa. Further, adjustment of the nut 46 does not result in any noteworthy change of the initial tension of the spring I in any given position of the roller 6, such initial tension being determined substantially wholly by the adjustment of the nut 46. The initial tension of the spring I is the tension of the spring 1 when the auxiliary air valve I4 is in its normal, or fully closed, position. This initial tension usually has to be relatively small in all positions of the roller 6 along the length of the spring.

The invention is not confined to the embodiment described above for the sake of explanation, as even if this embodiment has been found to be especially advantageous it will naturally be possible in constructional respects to vary the same without departing from the spirit of the invention or the scope of the appendant claims.

What we claim and desire to secure by Letters Patent is: r

1. An auxiliary air controller adapted to act in conjunction with a main air supply valve of internal combustion engines of the character described, comprising an auxiliary air inlet valve,

a leaf spring adjustably mounted at one end and having its other end adjustably connected to the said valve for biasing the same towards closing position, and a member forming a movable support for said spring between the ends thereof and adapted to be operatively connected with the said main air supply valve, the said leaf spring being unrestrained. between its two said ends but for the support through said movable supporting member.

2. An auxiliary air controller as claimed in claim 1,.in which the said leaf spring is housed in a casing for the auxiliary air supply valve and is secured at one end to a holder which is slidably mounted on a bolt secured in the said casing in an inclination of about to the axis of the said valve, the said holder being adjustable on the said bolt by means of a nut and a spring pressing the holder against said nut.

3. An auxiliary air controller as claimed in claim 1, in which the said leaf spring is secured to an arm projecting from an ear loosely fitted on a bolt arranged in an inclination of about 45 to the axis of the auxiliary air valve, said ear being provided with a second projecting arm which is slidable in relation to a fixed abutment against which it is pressed by a spring through the action of which the said ear simultaneously is pressed against an adjustable nut on the said bolt. I

4. An auxiliary air controller as claimed in claim 1, in which the auxiliary air valve has a stem the end of which projects through a hole in the free end of the leaf spring and-is provided with an adjustable nut.

AXEL HUGO WEIERTZ. PER AXEL REINAR WEIERTZ. 

